i.e.
db = firestore.Client()
query = db.collection('cities').order_by('population').start_at(1000000)
rather than the current
db = firestore.Client()
query = db.collection('cities').order_by('population').start_at({'population': 1000000})
/cc @samtstern @jonparrott
i.e.
rather than the current
/cc @samtstern @jonparrott